import java.text.DecimalFormat;   
import java.text.NumberFormat;   
import java.text.SimpleDateFormat;   
import java.util.Calendar;   
  
public class Crack {   
    public static final void main(String[] args){   
        String id="jack";   
        String num="2";   
        System.out.println(getSerial(id,"100",num,false));   
    }   
    public static String getSerial(String userId, String version,   
            String licenseNum, boolean selected) {   
        Calendar cal = Calendar.getInstance();   
        cal.add(1, 3);   
        cal.add(6, -1);   
        NumberFormat nf = new DecimalFormat("000");   
        licenseNum = nf.format(Integer.valueOf(licenseNum));   
        String verTime = selected ? (new StringBuffer("-")).append(   
                (new SimpleDateFormat("yyMMdd")).format(cal.getTime())).append(   
                "0").toString() : "-0812310";   
        String type = "YE3MB-";   
        String need = (new StringBuffer(String.valueOf(userId.substring(0, 1))))   
                .append(type).append(version).append(licenseNum)   
                .append(verTime).toString();   
        String dx = (new StringBuffer(String.valueOf(need)))   
                .append(   
                        "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.")   
                   
                        .append(userId).toString();   
        int suf = decode(dx);   
        String code = (new StringBuffer(String.valueOf(need))).append(   
                String.valueOf(suf)).toString();   
        return change(code);   
    }   
  
    private static int decode(String s) {   
        int i = 0;   
        char ac[] = s.toCharArray();   
        int j = 0;   
        for (int k = ac.length; j < k; j++)   
            i = 31 * i + ac[j];   
  
        return Math.abs(i);   
    }   
  
    private static String change(String s) {   
        byte abyte0[] = s.getBytes();   
        char ac[] = new char[s.length()];   
        int i = 0;   
        for (int k = abyte0.length; i < k; i++) {   
            int j = abyte0[i];   
            if (j >= 48 && j <= 57)   
                j = ((j - 48) + 5) % 10 + 48;   
            else if (j >= 65 && j <= 90)   
                j = ((j - 65) + 13) % 26 + 65;   
            else if (j >= 97 && j <= 122)   
                j = ((j - 97) + 13) % 26 + 97;   
            ac[i] = (char) j;   
        }   
  
        return String.valueOf(ac);   
    }   
}  